Case insensitive name collisions

[joshuata]

A git checkout on Windows or modern MacOS causes problems due to case-sensitive naming.

warning: the following paths have collided (e.g. case-sensitive paths
on a case-insensitive filesystem) and only one from the same
colliding group is in the working tree:

  'data/admin/basissets/CC-PV5Z.BAS'
  'data/admin/basissets/cc-pV5Z.BAS'
  'data/admin/basissets/CC-PV5Z.BAS.meta'
  'data/admin/basissets/cc-pV5Z.BAS.meta'
  'data/admin/basissets/CC-PVDZ.BAS'
  'data/admin/basissets/cc-pVDZ.BAS'
  'data/admin/basissets/CC-PVDZ.BAS.meta'
  'data/admin/basissets/cc-pVDZ.BAS.meta'
  'data/admin/basissets/CC-PVQZ.BAS'
  'data/admin/basissets/cc-pVQZ.BAS'
  'data/admin/basissets/CC-PVQZ.BAS.meta'
  'data/admin/basissets/cc-pVQZ.BAS.meta'
  'data/admin/basissets/CC-PVTZ.BAS'
  'data/admin/basissets/cc-pVTZ.BAS'
  'data/admin/basissets/CC-PVTZ.BAS.meta'
  'data/admin/basissets/cc-pVTZ.BAS.meta'